shaft looseness

Dear Experts 

what is the best way to detect the shaft wear under the bearing inner race or under the sleeve specially i face many problems like that but the only frequency shown in the spectrum is 1XTS.

Example 

Overhung Fan 

variable speed motor (rated speed 1485 rpm)

dominant frequency 1XTS (H=10 mm./sec....Vertical=6 mm./sec.....A=4 mm./sec)

after balancing the vibration dropped to 2 mm./sec  but in two days the vibration reached 36 mm./sec at horizontal direction 1XTS dominant

vertical 25 and axial 8 but dominant is 3XTS 

please take a look at the attachement 

Shaft photos and measurement points after symptom being very effective 

 

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